Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron

Abstract

Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of pi(+/-) and K-+/- mesons. The data were collected by the HERMES experiment at the HERA storage ring using 27.6 GeV electron and positron beams incident on a hydrogen or deuterium gas target. The results are presented as a function of the kinematic quantities x(B), Q(2), z, and P-h perpendicular to. They represent a unique data set for identified hadrons that will significantly enhance our understanding of the fragmentation of quarks into final-state hadrons in deep-inelastic scattering. DOI: 10.1103/PhysRevD.87.07402

Extraction of partonic transverse momentum distributions from semi-inclusive deep-inelastic scattering, Drell-Yan and Z-boson production

“…The SIDIS data are taken from Hermes [74] and Compass [75] experiments. Both data sets have already been analyzed in previous works, e.g., refs.…”

Reevaluation of the parton distribution of strange quarks in the nucleon

“…HERMES has finalized the extraction of multiplicities for each charged state of π AE and K AE [8]. In the extraction, the correction for acceptance, kinematic smearing, losses due to decay in flight and secondary strong interactions, and radiative effects is accomplished by means of a smearing matrix which is generated with a Monte Carlo simulation.…”

SIDIS cross sections: perturbative and non-perturbative aspects

“…Instead, it turns out that, for SIDIS processes like those measured by COMPASS [13] and HERMES [14] Collaborations, where Q is only a few GeV's, the modeled non-perturbative contributions dominate over the entire range of measured q T 's. Therefore any resummation scheme would be inadequate in this case, and hardly applicable.…”